<!DOCTYPE html>
<html>
<body>
    <h1>JavaScript 函数</h1>
    <p>在这个例子中，myFunction 是一个函数构造函数：</p>
    <p id="demo"></p>
    <script>
        function myFunction(arg1, arg2) {
            this.firstName = arg1;
            this.lastName = arg2;
        }
        var x = new myFunction("Bill", "Gates")
        document.getElementById("demo").innerHTML = x.firstName;
    </script>
</body>
</html>